Shuttle tension



Aug. 12,1930. L.. c; BA-u-DwlN SHUTTLE TENS'ION Filed Oct. 12, 192B 2 Sheets-Sheet 1 42' gdfov n 1 u er wm gwdg/ M ugf. 12, 1930 L. c. BALDWIN SHUTTLE TENSION Filed oct. 12,` 192e 2 sneetssneet 2 Patented ug. 12,k 1.930

UNITED;esi-ms PATENT OFFICE "A LUTHER c. DALDWINgorPnoviDnNcnnHoDn ISLAND, AssIGNOnTO U; s. DOBBIN a` SHUTTLEr COMPANY,` or ritovIDENoE, RHODE ISLAND;r A CORPORATION OF RHODE i ISLAND fsiitrrrrn TENSION Appiiation inaoetober :12, 192s. seriaiNo. 312,111. f

This invention'pertains to weaving. and

relates more particularly to shuttle tensions. In the embodiments of the invention herein chosen for illustration 'the yarn "tensioning elements are housed directly in the wood of the'shuttle body as is f common practice in large shuttles,"V such as areemployedin duck looms or the like`,\although. certain of the broad features of the invention, as more fully described in mycopending application of even dateherewith, are capable of embodi` ment in ithat type oftension device in which the tensioning elements are carried by Por associated with a metallic tension-block seated in a'cavity of the shuttle bobbin.

In accordance-with the present invention the tension devicecomprises a pair of relatively niovable-tension,`plates5 the lower of which, as suggested jinv the .copending application-of H'. A'. Davol, 'Serial-No. 229,201,

may be fixed in the bottom of asuitable chamber lnear on'eendl of the `shuttle body', such plate preferably having' opposedf outwardly curledingers near `oneof its edges,the` fin-V gers constituting the'yarn Adeliver-yeye of the shuttle. The (upper tension element may take Y rany desirable form,-but in oneiillustrated embodiinent it consists of a circular; cup-like friction shoe having aisubstantiallyflat lower surfaceopposed lto the fixed bottom/plate and pressed downwardly byf an'f adjustable spring.` Onthe other hand, thisupperj elenient may consist of;V a substantiallyviiat or `curved plate,` preferably provided "with `an lupturned nose at its inner-end, and urged downwardly byan vadji'istable springas illusltrated,` fo'rjexample, in the Davol application vabove referred to. r i. f'

` Ina preferredarrangement the yarnpasses across the opposed Asurfaces `of the tension i elements in a substantially straight line and without encounteringV guides or other elements". tending to change `its direction, and .it

is preferredto provideone ofthe tension .,ele- 'ments,`for=eXanipl e the-fixed lower plate, Y with means tending toi-prevent mispla'ement i of the yarn in a forward or rearwardfdirecy tion, `when the-shuttle isV stopped and started. V- n The Vyarn delivery eye, constitutedbypthe upwardly curvedain'gers 'above referred to,` is

provided with ya'threadingopening in its periphery `and preferably, although not neces- Sarily,` a threading slot in the shuttle body is so arranged as to terminate in substantial regi istry `with they threading opening in the shuttleveye, thusffacilitating thedelivery of the yarn-into the eye. Y i 'e One difficulty encountered in tensions. of this general type is that of keeping .thetensionvr elements in proper position relatively to each other and to the shuttle bodyfsince the extremely severe vibration and rapid` blows to which the shuttle is subjected in `use tends to loosen and dislodge 'all parts mounted thereon. `In accordance with the present invention I provide simple but very effective means for retaining the fixed tension member 1 in :position without resort to a multiplicity of bolts or other independentfasteners, thus avoiding the danger incidentto the use of suchremovablefastening elementsin iashuttle structure.. As one `desirable mode of attaining thisresult I provide .the tension chamber inthe shuttle body with downwardi ly di'vjergentpwalls and `forcethe lower ten-` hsion'platejendwise'intothe bottom ofithis chamber soV that it isheld firmly in place by i the overhanging portions of thefwalls.

Preferably the nu'pp'er tension-element is urgedl downwardlyyby means of `a spring ,whoseftension may bedetermined by means vof an adjusting screw','` and toprevent accidental movement ofthe adjusting screw I guiding tlieyarn in the'proper direction.y

- In the accompanying drawings in which certain `desirable embodiments of the invention are-'illustrated,vf e Y, Ifig;` lgis avfragmentary plan View, partly in`section,`illustrating a-,preferredembodimentl ofthe linventionas applied to a shuttle :ofthe type-employed in a duck loom;

f Fig. 2 is a fragmentary side elevation, partly insection, of the devices shown in Fig. 1;

Fig. 3 is a vertical section substantially on the'line 3-3 'of Fig. 1;

Fig. 4 is a plan View, to larger scale, showing the lower tension plate removed from the shuttle body;

yF ig. 5 is a vertical section, substantially on the line 5.-5 of Fig. 4, greatly exaggerating lcertain features for purposes of illustration;

Fig. 6 is a side elevation of a shuttle provided with tension means of modified form;

Fig. 7 is a fragmentary side elevation showig. 8 is a fragmentary plan view of the i f shuttle .of Figs. 6 and 7.

Fig. 9, is a vertical section on the line 4-4 ofFig. 8, certain parts being indicated in Fig. 10 is a detail elevationalV view indicating the first step in the formation of a thread delivery' opening of the kind shown in Fig. 6, the osition of the groove-forming tool bein in icated in dotted lines;

' ig. 11 is a fragmentary elevation showing an Aoptional arrangement of the lower frictionk plate. and the; undercut delivery chamber; and

Fig. 12 is a view similar to Fig. 11, but illustrating the arrangement of Fig. 6 to larger scale.

Referring first to the arrangement shown in Figs; 6 yto 12 of the drawings, the numeral 1 indicates'the body portion ofa loom shuttle 3,' having tlienose or end portion 2. This shuttle is provided with a bobbin chamber 3 and with a transverse tension chamber or thread delivery passage 4 which is arranged in the yend portion 2 and which is connected tothe bobbin chamber 3 by a horizontal slot 5'.' A curved threading slot 6 is arranged substantially atright angles to the plane yof thev slot 5, as shownin Figs. 7 and 9, p f

Upper and lower friction andtensionplates 12 and 1'1 respectively, of hard wear-resistant materialV for example heat treated steel', are arranged within the'chamber 4. Anpin 7 having a threaded head engaging the wood of the l v 'shuttle body extendsupwardly through these plates and is threaded into a retaining nut 9 [which engages the end ofja spring 110 that yield'ingly urges l the plate 12 v downwardly ltoward-the plate 11. The upperplate 1-2 is l"preferab'ly provided with an upturned or rounded edge portion, for 'example the point- --ednose 14, whiehisl adapted to cooperate with vthe' iatupper surface of the plate 11 in providingaffiared throat to receive the yarn from 'Y f the slot 5 and to guide it so that it ma readilybe drawn between the opposed sur `aces of the plates, The lower plate -11 preferably is provided withl integral upwardly curved lingers 16 at itsv outer end, said' fingers constituting a yarn deli-veryfeye at the end ofthe chamber 4 and' being. adapted to receive. and to ine' the opposite side of the shuttle of Fig.l 6; l

guide the thread after it leaves the tension plates.

The tension receiving chamber 4 may be yformed initially by the use of any suitable round bit or boring tool so that a round opening: extends transversally across the nose portion of the shuttle. Such an opening is indicated by the numeral 18 in F ig.` 10. If desired, that end of this delivery, passage which is to receive the thread eye may be formed by means of a tool of smaller diameter and may subsequently be enlarged to substantially the vergent sidewallsconveniently formedr by` the, use :ofa triangular broach or similar tool. This broach isv preferably positioned in relation to the original opening 18, as indicated by the dottedlines 20 in Flg. 10. Thus the original round opening 18 is provided with an upper angular recess or groove 21 and with lower recesses or groovesl 22 which are opposite each other and which give a maximum width to. the opening at its bottom.

The lower friction plate is preferably so dmens'enedthat it; maybe driven 0r forced eIldW-ise into firm engagement with the walls ofthe-grooves or undercuts 22. Tofacilitate this, theedgesurfaces of the plate may be beveled, as shown in F ig.A 1l, so that the plate (here designated lla) is. substantially trapezoidal in cross section. Alternatively the plate may be left substantially rectangular in cross; section and' may be drlveninto place, euttnginte er compressing the wood, and

when in. final position being disposed,y as. ndeatedinFfgsi Gand 1 2. j

In either. ease the epemng` .4

portionsnthatare adapted to overhang the edges; ofthe lower friction plateand hold it irmlyin place, while the upper groove 21` is disposed above the pointed nose 14 of the uppei-plateA so that the latter is prevented from turning to any substantial extent about the The lower friction plate ,is thus' anchored firmly in place by its engage pin 7 as, an axis.

ment Withthe woodloftheshuttle body while the upper plate is held againstV objectionable movement'by engagement of its nose withthe ,groove 2,1.; When thus mounted the friction `platesareheld securely in place andwill not loosen during use of the shuttle.

VReferring now to Figs. .1 -to 5` inclusive,

which illustratey a preferred embodilnent of Vthe inventionthe shuttle body 31 having the nose portion'32 is provided with the usual -loobbin-receiving chamber 33 and with a transverse,tension-receiving chamber 34 (Fig.

in its nose portion. A curved, substantially vertical` threading slot 36v extends .,1:

hasA side wir` 'downwardly from `the upper surface ofthe shuttle body into `the chamber 34;` This slot 36 Vopens into thebobbin chamber 33 at the point 35 and its other end 35a (FigfQ) is preferably disposed.substantially in' registry with thethreadin'g'openingin'the yarn guide eye as hereinafter more fully describd.

Preferably the tension-receiving chamber 34 is provided with a lower part having downwardlydivergent side walls 34a conveniently formed like the walls ofthe opening 4 above described by the use of a broach orthe like. In this lower part I inount'thelower tension element 41.6 Preferablythe lower tensionV asfthe lower tension' elements-11 above described; The plate 4l carries a yarn guide eye consisting preferably of integral upward ly curved fingers 46 located at theouter edge of' the plate 4l, said fingers overlapping at their ends but being .spacedy to provide a :threading-opening 47 of `more or less helical Vlower tension platefor renewal, I may provied the c hamber34 with an extension or pasy sage 34h, opening atthe opposite side yfof the form extendingperipherally `into the eye; This opening 47 is preferably disposed in registry with the end 35a of the thread;

threading slot 36, fas above described, so that the thread drops readily into the delivery eye without opposition. i s

Preferably, for convenience in manufac- A ture, the slot 36 is of circular curvature,and

within the arc formed by this slot'and concentrically with such arc,if desired, I provide a vertical ybore (Figs. 2 and 3) in the wood of the shuttle body, such bore extending downwardly into the chamber 34. fWithin this bore I dispose an upper tension element 44, prefe'rablyfof cuplike form having a substantially fiat under surface' opposed to the upper surface of the plate 41.7V Preferably the lower edge or corner of the tension ele- Y ment or friction shoe 44 is smoothly rounded,

providing a flare-d throat to facilitate entrance of the thread between the upper and lower lfriction members. Aspring is seated within the cuplilre friction shoe V44, and the tension of this spring may be adjusted by means `of a screw 49 having threadedengagement with an internally threaded upperfportion of the bore 45. In order to holdthis screw'49 in adjusted position, I prefer to provide re-` taining means of automatic type. Thus'I may provide a transverse bore 5l in they shuttle. body, V.suchV bore` being internally threaded for thereception of ascrew 52 which engages one end of a spring 53 seated within Y the bore. The other end of the spring bears 49,. `Similar retaining nieans'maybe .Y provided forthefnut 9 of Fig.` 9.

The plate 4l is preferably provided with an opening 57: Wholly to one sidey of the friction shoe 44, it being `noted that in this case the lower tension member isof much larger area than the upper tension member;` A guide pinl 58 passes through'the opening 57 and is firmly secured above and below Vthe plate 4l in the wood of the shuttle body. The pin 58 and the delivery eye comprising the `fingers 46 are disposed at opposite sides of the friction shoe 44, and thus cause theyarn toex-` `tend in asubstantially straight run between the tension members. 'If desired the plate 41.

may be provided with a shallow groove 56 eX- tending'froInadjacent to the pin 58 substantially to the delivery eye comprising the vfin- 1 ing to prevent it from escaping from beneathv the upper tension member in a forward or is sudp rearward:V direction when the shuttle denly stopped or startedxv t,

If`des1red, to Lfacilitate removal Lof the shuttle'bobbin and through which asuitablo tool .may bewintroduced 'for driving out the lower tensionplate.'` i c `l.y A shuttlehaving a chamber therein, and

a tension elementin said chamber, the'cham- Vber .Y having side wall portions inclined `inwardly'. vtoward each other `and overhanging the `.tension elementV for. holding the latter1 firmly in position,"the inwardly inclined side vrwall ,portionsl being spaced fapart .above the tension element to define with the tension elevnient a passage for yarn or thread. i 2L A` shuttle having `a ychambery therein, and -V atensionplatehaving beveled edgesdisposed in. said chamber, said Y chamber: having opposed wall'portions inclined toward each other and in overhanging engagement with said bevelede'dges, the inclination of the op- 1 posed wallportions being substantially the same as the 'inclination of said beveled edges, therebyfirmlyholding the Iplate in position.;

\ 3. shuttle having a transverse opening therethrough, a portionat leastof` said openf .ing having angular grooves in itsv .opposite jside' lwallsand a tensioniplatel disposed inthe` :bottom of said opening with itszedges engagf ing said grooves, the-inner end of the platebezingiaocessiblethrough the `opening for`engagernent by a tool fordri-ving the plateout vof the shuttle body. l 'i against a detent member 54 having a' tooth v's vadapted to yengage any one of a series of re' cesses forinedin the periphery of the screw 4; A shuttle having a bobbinvchainben a j transverse -t-hreaddeliver'y chamber and a slot connecting-said fchamb'ers, tension eleupper plate.A

l ments in the delivery chamber, a spring tend- 1 ing to hold the tension elements in engagement with each other,l anda deliveryI eye adapted to receive the' thread after passing l, between tlie tension elements, the delivery chamber having inwardly inclined wall portions which overhang the edges of one of the tension elements and hold the latter firmly in place.

, 5. A shuttle having a ybobbin chamber,a

transverse; tension .receiving chamber, and a slot connecting the chambers, tension elements 1n the tension receiving chamber, a

1 lspring tending toy hold'the elements in `engagenient with each other, van eye adapted to receive the thread after passing Vbetween the tension elements, tlie upper element havinga smoothly rounded upturned portion providing a flaring entrance -throat to facilitate entry of the yarn between said tension elements, the tension receiving chamber having sides meeting in angular grooves, one at least of'said tension elements engaged Y an ofpposed pair of such` grooves with a driving . A shuttle tension comprising a substantially flat lower friction plate, an upper tension element movable toward and from said plate, spring ni'eansurging the upper tension elementfdovvnwardly,z and upwardly directed fingers at the. outer edgel ofthe lower platev constituting a yarn guide eye, the lower plate having a shallow channel directly below the upper tension element, said channel tending to prevent displacement of the yarniinf a forpermanently fixed oppositely curved fingers overlapping at their endsl and spaced to pro'- vide a .threading opening, the shuttle body having a .curved slot extending from the bobbin chamber into the tension receiving chamber and having its outer end in substantial registry'withy the threading opening in the guide eye, the threading opening of the guide eye being disposed directly across the end of the curved slotwheieby the latter may guide yarn directly into the threading opening of the guide eye. v

10. In combination with a shuttle body havinga bobbin chamber, a tension chamber, tension means within the tension chamber including a fixed bottoni plate, a spring pressed cup-like friction shoe, the bottom plate having upwardly and oppositely curved overlappingarms constituting a guide eye, the ends of said arms being spaced to provide a helical threading opening, the shuttle body having a vertical slot of substantially circular curvature, said slot extending downwardly into the tension chamber, said slot terminating at one end in the bobbin chamber and at its other end substantially `registering with the threading opening of the'sliuttle eye.

Signed by me at Providence, Rhode Island, this 9th day of October, 19728'. y

' LUTHER C. BALDWIN.

ward/or rearward. direction from below the 7. InY combination with: a shuttle,a,tensi'on y ydevice'comprising opposed. relatively movable friction elements of hardwear-resistant material, and meansresiliently urgingzone of said` elements towardtheother to tension a yarn passing between them, oneiof said elef ments having a shallow channel in its surface extending transversely' to the length of the :shuttle and adapted: to oppose escape of the yarn laterally from between the friction elements. u Y v v `8. A shuttle tension comprising a-substanytially fiat lower plate of wear-resistant material, a cup-.lil'iefriction shoe having a suby .stantially iiatlower surface opposed to the lower yplate andreof relatively small area as compared to the latter, said cup-like shoe having a smoothly roundedlower edge, a spring within the cupflike4 shoe normally urging it toward thelower'plate, a fixed wear-resistant v'guide disposed to one `side of the cup-like shoe, and means integral withpthe lower plate 9. In ycombination witha shuttle body havi ing a bobbinf chamber and atensioni receiving chamber, yarn-tensionmeans.within saidlatter chamber, a; guide eye comprising a p air` of constitutinga yarn guide eye. at the otherside of said` cup -like shoe.

CERTIFICATE or CORRECTION.

Patent No. 1, 772, 449. Granted August 12, 1930, to

LUTHER C. BALDWIN.

It is hereby certified that the name of the assignee in the above numbered patent should have been written and printed as "U. S. Bobbin & Shuttle Company, 1929", instead of "U. S. Bobbin & Shuttle Company", as shown by the records of assignments in this office; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 23rd day of September, A. D. :1930.

M. J. Moore, Acting Commissioner of Patents.

(seal) 

